The Study On Corrosion And Durability Of Concrete In Municipal Sewerage

The corrosion mechanism of concrete in municipal sewage, including all sorts of corrosion factors such as acid, alkali, salt, organic compound, inorganic compound, erosion, microorganism, climate and so on, is extremely complicated, which is a cross-subject involved in bioscience, chemistry, material science, structure engineering and water treatment technology, etc. in order to improve the concrete durability, with a view to the actual operation situation of sewage disposal structures, design the special experiment, make the artificial strengthened sewage and simulation sewage, simulate the typical environment, investigate various concrete comprehensive degradation law nearby water surface as well as underground pipeline systematically, measures the stabilities of different concrete under relevant environments, and points out that freeze-thaw is uppermost damage cause of concrete nearby water surface, the microorganism corrodes and the ones by salt is similar; in the area under water, especially underground pipelines, the microorganism corrodes plays a main role. In addition, the experiment indicates the simply overlap of all factor is inferior to whose comprehensive effects. Intermingle with a great deal fly ash and slag as well as low water-cement ratio is effective measure to improve anticorrosive and volume stability of concrete, but the best amount of mineral material should not exceed 50 percents. On the basis of a large number of experimental data's, degradation predicts models of concrete is set up under different environments, BP artificial neural network for concrete durability appraisal model is obtained finally, which will be helpful and indispensable to structural design under polluting environment.